Steam-actuated valve



(No Modei.) v 2 Sheets-Sheet 1.

' J. B. MAAS.

. STEAM AGTUATED VALVE.

No. 343,911. Pat'entedJune 15, 1886.

1.7V VEJV TOR (NO'ModeL) 2 Sheets-Sheet 2. J. B. MAAS.

STEAM AGTUATED VALVE. No. 343,911. Patented June 15, 1886.

. M/aw 1 l m I WIIIWESSES HAIEN OFFICE.

JOHN B. MAAS, OF HUMBOLDT, MICHIGAN.

STEAM ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 343,911, dated June 151886.

Application filed September 14, 1885. Renewed May 20, 1886. Serial No.202,806. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN B. MAAS, acitizen of the United States,residing at Humboldt, in the county of Marquette and State of Michigan,have invented certain new and useful Improvements in Steam ActuatedValves, of which the following is a specification, reference being hadtherein to the accompanying drawings.

This invention relates to certain improvements in that class of devicesk nown as steamactuated valves, in which the valve is mainly moved backand forth by the direct action of steam; and it has for its object toprovide a simple and efficient device which will operate quickly anduniformly, as more fully herelnat'ter specified. These objects I attainby the means illustrated in the accompanying drawings, in which- IFigure 1 represents an elevation of my invention, showing the valve indotted lines. Fig. 2 represents an elevation at right angles to that ofFig. 1. Fig. 3 representsasectional view of the valve and valve-casing,taken on the line at w of Fig. 2. Fig. 4 represents a cross-section ofthe valve detached, and Fig. 5 an elevation of the valve detached.

The letter A indicates the valve-casing, B the induction-port of thesame, and O the exhaust-ports.

The letter D indicates the ports leading to the respective ends of thestean'i-cylinder in which the piston travels, which is constructed inthe usual manner.

E indicates a cylindrical valve, which is located in the valve-casingand is arranged to oscillate therein. The said valve is provided with avalve-shaft, G, which extends through a central packing-box, H, and hasat its outer end an oscillating arm, which is moved back and forth bysuitable tappets or other mechanism receiving its motion from the pistonof the engine in order to give the valve its initial movement. The valveis provided with two transverse steam ports, H, which connectalternately with the steam ports leading to the cylinder and theexhaust-ports as the valve is oscillated.

I indicates a segmental recess in the upper adapted to connectalternately with the reliefports M, extending through the walls of thevalve-chest, as shown in Fig. 2 of the drawings.

The operation of my invention will be readily understood in connectionwith the above description, and is as follows: The steam enters throughthe induction -port and passes down through one of the ports H, throughthe valve, and into one end of the steam-cylinder, moving the piston inone direction. When the piston is at the end of its stroke, a slightinitial movement is given to the valve by the mechanism operating thevalveshaft, so as to let the steam in on one side of the tongue and cutit oif on the other. The pressure of the steam acting directly on oneside of the tongue gives the final movement to the tongue, causing thevalve to change the ports, and thus keep up the motion of the engine.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

The combination, with the valve having suitableinduction and eductionports and ports leading to the steam-cylinder and relief-ports, of thevalve having corresponding ports, and the radial tongue working in arecess in the valvecasing, whereby the valve is operated by the pressureof steam after its initial movement, substantially as specified.

In testimony whereof I affiX my signature in presence of two witnesses.

JOHN B. MAAS.

\Vitnesses:

WILLIAM J. Mans, EDWARD A. MAAs.

